Year	Percent
1995	37.86
1996	40.08
1997	40.5
1998	40.57
1999	40.37
2000	36.17
2001	37.13
2002	38.03
2003	37.98
2004	40.28
2005	40.87
2006	40.79
2007	41.41
2008	39.96
2009	39.27
2010	39.77